Operations - NEC Renesas V850/SC1 User Manual

11.2.3 Operations

CSIn has the following two operation modes.
•
Operation stopped mode
•
3-wire serial I/O mode
(1) Operation stopped mode
In this mode, serial transfers are not performed, thus enabling a reduction in power consumption.
In
operation stopped mode, the SIn, SOn, and SCKn pins can be used as normal I/O port pins.
(a) Register settings
Operation stopped mode is set via the CSIEn bit of serial operation mode register n (CSIMn).
After reset: 00H
<7>
CSIMn CSIEn
(n = 0, 2, 3)
CSIEn
0
328
CHAPTER 11 SERIAL INTERFACE FUNCTION
Figure 11-2. CSIMn Setting (Operation Stopped Mode)
R/W Address: CSIM0
6 5
0 0
SIOn operation enable/disable specification
Shift register operation
Operation disabled
User's Manual U15109EJ3V0UD
FFFFF2A2H
CSIM2 FFFFF2C2H
CSIM3 FFFFF2D2H
4 3
0 0 MODEn
Serial counter
Cleared
2 1 0
SCLn1 SCLn0
Port
Port function